Disable path_style S3 URLs for syncing

Experiment to resolve issues with signatures, but probably a good idea anyway.

config.rb

@@ -95,6 +95,7 @@ class << self
   s3_sync.bucket       = ENV['S3_BUCKET']
   s3_sync.region       = 'us-east-1'
   s3_sync.prefer_gzip  = false
+  s3_sync.path_style   = false
 end
 
 # these files have long lived cache haaders